公开(公告)号：US20210185719A1

公开(公告)日：2021-06-17

申请号：US17094115

申请日：2020-11-10

Applicant: QUALCOMM INCORPORATED

Inventor： Yisheng Xue ,  Xiaoxia Zhang ,  Chih-Hao Liu ,  Jing Sun ,  Yongbin Wei

IPC: H04W72/14 ,  H04W72/12 ,  H04W72/04 ,  H04L5/00 ,  H04W74/02

Abstract: Wireless communications systems and methods related to channel access contention management in a shared radio frequency band are provided. A first wireless communication device communicates, with a second wireless communication device, a grant for communicating a first communication signal, the grant indicating a listen-before-talk (LBT) configuration. The first wireless communication device communicates, with the second wireless communication device, a LBT configuration modification after communicating the grant. The first wireless communication device communicates, with the second wireless communication device, the first communication signal based on the LBT configuration modification.

公开(公告)号：US11025403B2

公开(公告)日：2021-06-01

申请号：US15991829

申请日：2018-05-29

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Chih-Hao Liu ,  Tamer Kadous

IPC: H04L5/14 ,  H04L5/00 ,  H04L1/00 ,  H04W72/04

Abstract: A method, an apparatus, and a computer program for wireless communication that allows for greater scheduling flexibility of physical resources are disclosed. A UE receives information from a base station about a time division duplex (TDD) frame structure of a plurality of frames that include a plurality of subframes. The UE determines a control channel search space within the plurality of subframes based on the information. The UE determines a search strategy including a maximum aggregation level based on the control channel search space. The UE performs a blind decoding of the control channel search space with the search strategy to obtain control information. The control channel search space may include a size and a location of a subset of the DL subframes allowed to carry the control information. The UE may determine a plurality of UL subframes assigned for transmitting scheduled UL resources associated with a UL control signaling.

公开(公告)号：US11012922B2

公开(公告)日：2021-05-18

申请号：US16040098

申请日：2018-07-19

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04W48/12 ,  H04W48/16 ,  H04L5/00 ,  H04W52/58 ,  H04W74/08 ,  H04W72/12 ,  H04L27/26 ,  H04W72/04

Abstract: Methods, systems, and devices for wireless communications are described. A base station and user equipment (UE) may utilize an enhanced physical downlink control channel (ePDCCH) within a common search space to establish a MulteFire connection. The common search space may include a common PDCCH (C-PDCCH) and a MulteFire system information block (SIB-MF1) grant. The base station may define one or more common search spaces for the SIB-MF1 grants and C-PDCCH and signal the resource allocation for the common search spaces to the UE within a master information block (MIB). Each common search space may include a fixed set of control elements that the UE monitors for decoding the SIB-MF1 grants and C-PDCCH. In some cases, the base station may hardcode resources for the SIB-MF1 grants and C-PDCCH. Alternatively, the base station may signal the resources for each of the SIB-MF1 grants and C-PDCCH via reserved bits in the MIB.

公开(公告)号：US10938441B2

公开(公告)日：2021-03-02

申请号：US16911180

申请日：2020-06-24

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04B1/7143 ,  H04L5/00 ,  H04B1/7136 ,  H04W16/14 ,  H04B1/713 ,  H04W48/16 ,  H04L27/26

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. In one example, the apparatus may be a base station. In certain configurations, the apparatus may transmit information indicating a narrowband frequency hopping pattern to at least one UE. In certain aspects, the narrowband frequency hopping pattern may correspond to a plurality of frames. In certain other aspects, the plurality of frames may include at least one non-anchor channel and being associated with a plurality of anchor channels. The apparatus may communicate with the at least one UE using the narrowband frequency hopping pattern, including concurrently transmitting a discovery reference signal (DRS) in each of the plurality of anchor channels at a start of each hopping frame. In certain aspects, communication on the plurality of anchor channels may occur during the same frames.

公开(公告)号：US10833760B2

公开(公告)日：2020-11-10

申请号：US16531538

申请日：2019-08-05

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04W72/00 ,  H04B7/26 ,  H01Q1/24 ,  H04B7/0491 ,  H04W72/08 ,  H04W16/24 ,  H04W8/00 ,  H04W16/14 ,  H04W4/70 ,  H04W36/30 ,  H04B7/06 ,  H04W36/06 ,  H04W48/18 ,  H04W88/04 ,  H04W74/08 ,  H04W88/06

Abstract: Described techniques provide for switching a user equipment (UE) between different coverage enhancement (CE) modes, such as between a non-CE mode and a CE mode. A UE may determine that a CE mode switch is to be performed and may initiate the mode switching. The UE may compare signal qualities of signals from one or more base stations against one or more threshold values and determine that a switch from a CE mode to a non-CE mode, or from a non-CE to CE mode, is to be performed. In some cases, a UE may be in idle mode and switch between CE modes, or may perform a cell reselection to a different base station. In other cases, a UE may be in connected mode and may declare a radio link failure to initiate a mode switch. A base station may initiate mode switching based on radio link monitoring of UEs.

公开(公告)号：US10687359B2

公开(公告)日：2020-06-16

申请号：US15987511

申请日：2018-05-23

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Chih-Hao Liu ,  Tamer Kadous

IPC: H04W74/08 ,  H04W16/14 ,  H04W56/00 ,  H04W74/00

Abstract: Methods, systems, and devices for wireless communications are described. In some wireless systems utilizing shared radio frequency spectrum bands, base stations may operate in different listen before talk (LBT) modes. For example, a base station may operate in an LBT enabled mode or a non-LBT enabled mode. A UE may perform system acquisition with the base station based on receiving acquisition signals (e.g., synchronization signals and physical broadcast channel (PBCH) signals) from the base station. These acquisition signals may depend on the LBT mode of the base station. For example, the frame timing and number of subframes for the acquisition signals may be based on the LBT mode of the base station. In some cases, a base station may adaptively switch LBT modes, and the UE may re-synchronize with the base station based on an LBT configuration period or a paging message from the base station.

公开(公告)号：US10484954B2

公开(公告)日：2019-11-19

申请号：US15855442

申请日：2017-12-27

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04W56/00

Abstract: Methods, systems, and devices for wireless communication are described for synchronization for wideband coverage enhancement. A user equipment (UE) may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a subframe. In one example, the SSS may be received in a symbol that is after a symbol in which the PSS is received, and after a set of symbols in which a set of other synchronization signals is received. In another example, the PSS may be received in each of a first plurality of consecutive symbols, and the SSS may be received in each of a second plurality of consecutive symbols, wherein the second plurality of consecutive symbols is after the first plurality of consecutive symbols within the subframe. The UE may synchronize with a base station based at least in part on the PSS and the SSS. Numerous other aspects are provided.

公开(公告)号：US10425973B2

公开(公告)日：2019-09-24

申请号：US15358745

申请日：2016-11-22

Applicant: QUALCOMM Incorporated

Inventor： Chirag Sureshbhai Patel ,  Tao Luo ,  Chih-Hao Liu

IPC: H04W74/08 ,  H04B7/26 ,  H04L5/00 ,  H04L5/14 ,  H04W48/10 ,  H04W52/16 ,  H04W74/00 ,  H04W84/12 ,  H04W16/14

Abstract: Techniques for random access channel signaling on a shared communication medium are disclosed. A broadcast message including information associated with a Physical Random Access Channel (PRACH) may be transmitted and received on one or more subframes in a portion configured for downlink signaling. The broadcast message may comprise a contention type indicator, a timing advance indicator, or a combination thereof. The contention type indicator may indicate whether contention is in effect for transmission on the PRACH. The timing advance indicator may indicate whether an uplink transmission offset is in effect for transmission on the PRACH. Signaling over the PRACH may be transmitted and received on one or more subframes in a portion configured for uplink signaling.

公开(公告)号：US20190149185A1

公开(公告)日：2019-05-16

申请号：US16242969

申请日：2019-01-08

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Chirag Sureshbhai Patel ,  Tamer Kadous ,  Hao Xu

IPC: H04B1/403 ,  H04L5/00 ,  H04B1/00 ,  H04W72/04 ,  H04W16/14 ,  H04L27/00 ,  H04B7/26 ,  H04B1/26 ,  H04B1/707 ,  H04B7/24

Abstract: Methods, systems, and devices for wireless communication are described. Resources for narrowband communication in an unlicensed radio frequency spectrum band may be configured and allocated based on resource availability, regulatory constraints, and device capability or category. A narrowband wireless device, such as a machine type communication device or other relatively low complexity device, may communicate using one or more narrowband carriers, which may occupy between one tone and multiple resource blocks in an unlicensed spectrum band (e.g., any number of resources between one (1) tone and multiple resource blocks (RBs)). Different device types may thus be configured differently as they move between geographic regions. The base station may then communicate with the narrowband mobile device based on the resource allocation and the carrier configuration.

公开(公告)号：US20190141707A1

公开(公告)日：2019-05-09

申请号：US16180772

申请日：2018-11-05

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tamer Kadous ,  Chih-Hao Liu

IPC: H04W72/04 ,  H04W72/02

Abstract: A base station (BS) may communicate with a user equipment (UE) using a subset of channels. The BS may select a subset of a set of channels for use in communication with the UE. The BS may transmit, to the UE, a signal to identify the subset of channels. In some aspects, the BS may transmit, and the UE may receive, a channel list indicator identifying the subset of channels. The channel list indicator may include an integer value, which the UE may use to identify a subset of combinatorial factors. Based at least in part on the subset of combinatorial factors, the UE may identify the subset of the set of channels for use in communication with the BS. The UE may communicate with the BS using at least one of the subset of the set of channels, such as in a frequency hopping communication system and/or the like.